<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>伪类选择器</title>
    <style>
        a:hover {
            /* 任何标签都可以设置鼠标悬停的状态，选择器：hover */
            color: red;
        }
        /* div:hover */
        .box:hover {
            color: green;
        }

    </style>
</head>
<body>
    <a href="#">a标签，超链接</a>
    <div class=" box">div 标签</div>
    
</body>
</html>